Drawing sheet glass



L FL CRSDWLEY DRAWING SHEET GLASS Film March 2z, 1924 (hPa/@ y WM@ T RNE Y.

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Patented July 13, H925/ U'Nrruo stares earner tra JOSEPH P. CROWLEY, 0F TOLEDO, HIO, ASSGNOR TO THE LBTSE`TGVJ'EIIS SHEET GLASS CUMPANY, OF TOLEDO, GHR), A. GRPGRQEIN' GF GEIQ.

DRAWNG SHEET GLASS.

Application tiled March 22 This invention relates to the art oi drawing sheet glass, and more particularly to an improved procese and apparatus'. for drawing' Y a continuous sheet of glass vertically troni a mass of molten glass until it has become sub y reaches the horizontal plane, after which`l it is transportedv through the leer upon a series of driven conveying rollers in installations now in use. The arc through which the sheet is hent- Will be so large and the curvature so slightth at' at no time the liniit ot' elastici@r oi? the formed sheet will be exceeded. y The ries ot bending rollers are all enclosed. bya curved shaft or housing, which maintains the sheet at the proper temperature and serves in fact as a portion of the annealing leer.

The objects and advantages oi' the inven tion will be more clearly understood from the following detailed description ot one approved torni of the apparatus.

In the accompanying drawings:

Fig. l is longitudinal vertical section through that portion oi the aiiiparatus niore. directlT concerned with this invention.

F 2 is a. iraginental vieiv of one end of a pair of the sheet-engagingl rollers.

. Fig. 3 is a View showing the yieldable mounting for one end oi'l a` pair ot these rollers.

Fig. l shows a portion of the driving4 mechanism for the sheet-carrying` rollers.

The pool ot molten glass l from which the sheet is drawn is held in a shallow receptacle 2 into which the glass flows from one end 3 oi' the continuous tank furnace or other source oi supply. Receptacle '2 is mounted above a lheating chamber l which maintains the niolten pool l at the proper working teniperatiu'e. The glass sheet 5 is continuously drawn upward from pool vl, ont7 approved ineans heing provided for forming; the sheet and maintaining it at a constant Width atV its source. For example here shown` the edges of the sheet are drawn up between pairs of small driven rollers th and coolers G0, described more particularly in the pati 1924i. Serial No. Y'

ent to Colburn, Lili-81.809,' granted Deceniher si, i917. it is to he understood that this type of sheet-forming mechanism is merely shown by way of example and. that7 as ,tar as this invention is concerned, the sheet inay be formed at its source by any other approved system. i

Mounted vertically above the sheetsource is a pair oit sheetengaging rollers 7, and preferably a secondpair ci similar rollers 8 is also mounted vertically above and in linev with the iirst pair short distance therefrom. i

These pairs of rollers driven in such direction as to draw and. guide the sheet vertically upward until it. has become substantially set in fiat. sheet torni. These` rollers are preferably made of asbestos tu rnodtohave a comparatively true smooth peripheral sur-A face, and those rollers Will not injure the lirepolished surface ofthe sheet,l particularly since the lirst engaging pair of rollers i is orion-ged at such a height above the source or sheet 5 that the surfaces will ineconueV comparativeilsv hard before these rollers are engaged.

At intervals beyond and above the pair ot rollers 8 are a series/ott pairs of similar roll4 ll) in leer 1l. The degree of curvature is so slight that the liinit of elasticity oi' the sheet is never exceeded. In other Words, it'is not a vplastic sheet that is being bent through this leer but advantage is taken of the spring or elasticity in the set? sheet to bend it from the vertical. into the horizontal plane. If properly proportioned there should be no great strain imposed upon the sheet by the directing rollers 9, but the natural sag of the' sheet under the weight of the horizontally lying portion tliereolshould. bend the sheet substantiall)Y along the arc through which it is directed by these rollers. i i

Each of therollers 9 is mounted at its ends in bearing boxes l2 slidable toward'or lron'i one another in guides 13 onthe sides o t the enclosingl'housing. A compression spring 14A` bears at one end against bearing 12 and at its other end against an adjust-ing screw l5 adjustable' hy nut 16 through an earV 17 on the housing. ".ihese springs 14 A so oi* other oe ons-e. to immensi einem@ lo "which is passing sellers. end

'he supporting sha1-ii; of iitefi ioii; ieoisiieai similare geef oie the emi older These wie gef si: o the e ile iowei relier oi. facil passes ev Jee .i s .is 19 sioi 1 Signing-pisses ciggitezeef oies iiee o o the chain be'weeii each peil* ei'f spree is l3- to iioc. the chain eiig'egemenb' with Ae sproeiieis iiie freiem loof@ oi. this chain is nos heee showns buil ie be undesstooo1 met iiu's loop enga-"fes ei; some 'con-- vement piece with e driving mechanism wheeiey sii 'o the sets of roieis wii be simeiisneeusiy @Hives the seme speeda En mesi, ioims ci siieeil drawing meeiisedge portions Q9 ehe sisee; wii on ewiie thick-ef; theo the. mein To aeeommo L kicker edges'iiie opio-e5: iow of ieiieis 9 'are m somewhat shoyiei: time shown iii This loe the eiiiie wieiii; et? geit slieezeegogieg rognes eciiiiiet wien ehe ehicieeee; .f Giwiousiy, 'iiiis eiiengemeiit ceiiif ice reversed` tiisi is iiie E owei iow ioie's meid be made shorter than the opper row, oi' oo'zii o :eiiers ceuei be of 'tile sloerie?? fveiiiglii.

i ne eiiii'e series of eoiieis 9 is csrrieci io i 1 i# ie .ne lnoifll ee; Ll. uceqhln ioceied et any desired por ion of this ieee,

means may "se t m either poi although the boei, from me i opening in 'pi'ovided with cio-sure 28, the iop oeei il adjacent the upper emi curved housing 23, permitsiiie baie 'io inse-,1'E4 ci end iowesed between me pairs ,coiiers 9 Whosev dieciion. of :mistica is Een. reversed, inio the pool of molten giass to sieri the sheet drawing operation.

After ehe sheet has reached the horisoziiai piene, it 'will pass onto the supporting roilers l0 which are driven in any' approved manner as in similim instelistions new in use.

This iiissi-i'sion combines the advantages of drawing iaiteuing iie sheet, in the same vei'icei piene, with. the. advantages of annealing and cestino che SheeiJ ie the howl-- sente?, piene9 'Where diere .is no limit to of lees imi may be use .ieimsz l. fin the er?, of producing sheet glossy the process of drawing the sheet; 'from its moi'exi source in s vel-simil difection until solistenn tieii seti, and then bending the sheet; into enotxier plane along an are of sueh cuirvoure 'hat the bending strains Wii not exceeei the elastic limit of' the sheet.,

in iiie aii ci producing sheet glass, the process of chewing the silee from its molten source in a ve'iicei direction until Subsianiiely set, ehem beming ihe sheet grado eiiy into anoiec pleine, ne curvature at no ime being siicieiit to overcome the einsic limit of 'iiie sheet.

3. 1in he eri'. 01"' pi'oducing sheet glass, eine process oi' sewing the shee*J from its moiien source in e vertical direction untii set in fe sheet form, and then gz'sduaiiy bending the sheef into o iioihei plane Within iis imit of elasticity without destroyingiiie estab-1. lished iaiiess of the sheet. i

e. In the est of producing shee giess, Lhe process of drawing and iettening the sheet; in 'the seme vericei piene, then deieeting the continuous sheet after it has become substantially ses without exceeding its limit of elasticity iiice e; horizontal piane, and these mmeaiiiig the sheet.

. in the sreoi producing sheec giess, the

process oi' drawing end iiatenixif the siiee v rms-king sheer?y gisss, com coneiiiieg e poc-i 

